s390/bug: Add missing alignment

All objects are supposed to have a minimal alignment of two, since a
couple of instructions only work with even addresses. Add the missing
align statement for the file string.

Fixes: 6584ff203aec ("bugs/s390: Use 'cond_str' in __EMIT_BUG()")
Signed-off-by: Heiko Carstens <[e-mail]>

arch/s390/include/asm/bug.h

···
 #else
 #define __BUGVERBOSE_LOCATION(file, line)			\
 		.pushsection .rodata.str, "aMS", @progbits, 1;	\
+		.align 2;					\
 	10002:	.ascii file "\0";				\
 		.popsection;					\
 								\