dwarf: Fix uninitialized structure member.

dwarf2_loc.discriminator wasn't being initialized by
dwarf2_generate_line_section, leading to incorrect output, including
intermittent test failures in gen64/dwarf64_pathname.

modules/dbgfmts/dwarf2/dwarf2-line.c

@@ -621,6 +621,7 @@ dwarf2_generate_line_section(yasm_section *sect, /*@null@*/ void *d)
         bcinfo.lastfile = 0;
         bcinfo.loc.isa_change = 0;
         bcinfo.loc.column = 0;
+        bcinfo.loc.discriminator = 0;
         bcinfo.loc.is_stmt = IS_STMT_NOCHANGE;
         bcinfo.loc.basic_block = 0;
         bcinfo.loc.prologue_end = 0;

modules/dbgfmts/dwarf2/tests/gen64/dwarf64_pathname.hex

@@ -38,7 +38,7 @@
 00 
 00 
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-80 
+60 
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@@ -97,7 +97,7 @@ ec
 83 
 ec 
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-78 
+4c 
 00 
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@@ -151,10 +151,6 @@ fb
 04 
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-02 
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-5b 
-00 
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@@ -166,55 +162,15 @@ fb
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-5b 
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-5b 
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@@ -222,7 +178,7 @@ fb
 01 
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+38 
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@@ -414,6 +370,18 @@ fb
 00 
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+00 
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+00 
+00 
+00 
 2c 
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@@ -982,8 +950,8 @@ ff
 00 
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+e0 
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@@ -1046,7 +1014,7 @@ ff
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-8c 
+6c 
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@@ -1110,7 +1078,7 @@ ff
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-9c 
+7c 
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@@ -1246,7 +1214,7 @@ d8
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-7c 
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@@ -1302,7 +1270,7 @@ d8
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-e0 
+b4 
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@@ -1366,7 +1334,7 @@ e0
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-f8 
+cc 
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@@ -1430,8 +1398,8 @@ f8
 00 
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-0c 
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@@ -1494,7 +1462,7 @@ f8
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@@ -1558,7 +1526,7 @@ f8
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@@ -1622,7 +1590,7 @@ a0
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-d0 
+b0 
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