Remove extra whitespace.

libgfortran/generated/matmul_c4.c

libgfortran/generated/matmul_c8.c

libgfortran/generated/matmul_i4.c

libgfortran/generated/matmul_i8.c

libgfortran/generated/matmul_l4.c

libgfortran/generated/matmul_l8.c

libgfortran/generated/matmul_r4.c

libgfortran/generated/matmul_r8.c

libgfortran/intrinsics/etime.c

libgfortran/intrinsics/random.c

libgfortran/io/io.h

libgfortran/io/list_read.c

libgfortran/io/transfer.c

libgfortran/io/write.c

libgfortran/m4/matmul.m4